Reverse-control gear



P. G. MAY ET AL REVERSE COKTROL GEAR Filed July 25. 1923- a llllllllunmuum w (7 'wyg m By m ATTORNEYS.

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PHILIP 6%. MAY Alli) JUVEHAL GRIGNOLQ, OF SAN FRANCISCO, CALIFORNIA.

nnvnasn-con'racr. =G-EARL Application "filed m a,

To all whom it may concern:

Be it known that we, PHILir G. MAY and JUVENAL Gnionono, citizens of theUnited States, and residents of the city and county of San Francisco,State of California, have invented new and useful Improvements inReverse-Control Gears, of which the tollowing is a specification.

.Our invention is particularly adapted to motor driven vehicles and hasfor its object means and mechanism to prevent the vehicle -froi'n movingin a backward direction except when the mechanism is operated especiallywith th s intent.

A further oi-Fcct is the provision of mechanism in combr ation with thedriving connections of a motor vehicle to prevent the vehicle movingbackwards at times when the gear mechanism is set in what is known asthe neutral position.

A further object is means and mechanism to loch motor vehicle againstbackward movement.

Gther objects will appear from the drawingsand specifications which iollow.

Referring to the accompanying sheet of drawings.

Fig. 1- represents our invention applied to 4 a conventional gear drive,showing some of blers.

Fig. 5 is a plan view of Fig. 4. Fig. 6 is a front view of part of Fig.2

with one of the rollers and tumblers shown in its locking position.

.Fig. 7 is similar to Fig. 6 except that the roller and tumbler are hereshown in disen aged position.

hroughoutthe figures similar numerals refer to identical parts.

The stationary portionof the gear or transmission case of any well known.motor vehicle of conventional type is shown by the numeral 1. throughwhich the driven shaft 2 extends surrounded by the pac king gland. 3 onthe end of. which shaft is pro- 1923. serial No. 653,644.

vided the splined portion 5, and on which the loose gear 6 is adapted tofreely slide as by the action of the arm 7. The driving shaft is shownat 4:. The gear 6 may mesh as shown with the reverse gear 9 or witheither of the forward driving gears 10 or 11 or 12 in the several rangesof diilerent forward driving speeds. lit may also occupy the inertposition 14- or it may occupy neutral positions between the gears 10 o"11 or between 11 and 12. I i

The gear 6 is providedwith a hub Lo having a conical edge 16 on whichthe arms 17 of a plurality ot tumblers mayenter when the gear 6 isadvanced to the right on the spline 5, or leave the cylindrical surface15 when the gear is moved to the left as by the fork 7. At 18 isahardened steel collar keyed to the shaft 2-and against the outersurface ofwvhicli the cylindrical rollers or balls are seated inpockets, the said pockets having a sloping surface as 23,'whereby theroller is freed from contact withthe'collar 18 when at one end'of thepocket or wedges against the said surface 23 at. the other end of thepocket.

A spring 24 passing through a hole 25 bears against the roller 19 on oneend and at the opposite end bears against the similar roller 26, whichlatter roller seats against the inclined surface 27 in a similar pocketof reverse form-in the outer periphery of the member 22. -The tworollers 19 and 26 are therefore normally pressed apart by the spring 24.The roller 19 atsuch times wedging between the collar 18 and the surface23 and the roller 26 wedging between the surface 27 and the periphery 28of the adjacent member 29, which is preferably also a hardened collarfixed in a stationary element 1. At 30 is pivoted a tumbler having apawl end 31 on one side of the pivot and an extending arm 17 from itsother end 32 on the other side of the pivot, whereby the tumbler mayfreely move upon itspivot 30. to depress the ball 26 away from thesurface 28 26to wedge between the surfaces 27 and 28. While we havespecifically described the pair of rollers 19 and 26 and theirassociated mechanism and action, that there are a plurality of thesepairs of it will beunderstood rollers and associated.v mechanism spacedabout the axis of the shaft 2, whereby the side strains about the axisof the shaft" 2 are opposed to each other and therefore pre-.

' vent distortion under pressure.

It'will now be seen that when the gear 6 occupies the full line positionof Fig. 1 the ends 17 of the arms 32 will have been. forced outward bythe cone 16 and will thereafter ridejupon-the cylindrical surface 15 andthis 7 movement will cause the pawls 31 to force the rollers 26 out ofWedging contact with the surface 28 as shown in Fig. ,3 and at suchtime's the: gear 6 through the spline in which the pawls 31 will stillbe retaining sleeve. 5 will drive the shaft 2 freely in the direction ofthe arrow 40, this being the re- Verse direction or corresponding withthe backward -movement\of-,.thc vehicle. If

.now the arm? be manipulated to shift the gear 6 to the positionv shownin Fig. 1 the rstmovement upon its en agement of the reversing gear 9,will be tie position that the'rollers 26 out of engagement with thesurface 28 and the automobile may be freely driven backwards. I

I By shifting'the gear (ito'the position 1d it isdisconnected from-thereverse gear 9 but the arms 17 vstill ride on the surface i and therollers are still held in the position A as on the garage floor,

of Figs.-2 and 7, 'i'. e,,- out of engagement and the vehicle may befreely moved about being what is known as'o'ut of gear. U v The pivot isshown in dottedlincs in Figs. 4 and 5. The pawl and its arm 32 and end17 being preferably made of a single drop forging. v

A further movement to the left of the gear 6 results in the ends 17riding down the cone'16 and the; paw1s'31 being forced therefore be seenthat "in shifting of the gear 6 beyond the position 14 to the left whenthe gear 6 is in mesh with either of these gears 10 and 11 or 12, andalso during the several intermediate or neutral positions predeterminedposition for that specific purpose and that the vehicle is lockedagainst backward movement at all times when the gear shift 7 is in anyof its neutral positions.

Reference isherein made to my copending application, Serial No. 703,555filed April 1Sa-1924.

We claim:

1. In clutch mechanism, a shaft and a stationary element surrounding theshaft, a collar interposed between the shaft and the element, aplurality of rollers in sloping walled pockets interposed between theshaft and the collar and other rollers and sloping walled pocketsinterposed between the collar and the element, Wherebythe shaft is freeto rotate within the collar and the collar is free to rotate within theelement in one dimotion and each is locked against rotation in theopposite direction, and means for displacing the rollers on the slopingwalls to release the said locking engagement.

2. Clutch mechanism including the combination set forth in claim 1wherein the means for displacing the rollers includes levers pivoted tothe collarand having an exposed end, and a cylindrical member slidableon said shaftadapted to engage or dis-- engage the said ends.

In combination with motor vehicle gear driving mechanism, a shaft and agear thereon adapted to be shifted to engage any one of a plurality offorward driving gears and also having a range of movement bein thedirection of incyondlsaid engaging movement, clutch means permitting theshaft to freely advance and having rollers adapted to clutch said shaftagainst any reverse movement, and means actuated by' the first namedgear when shifted within said range to hold said rollers out of clutchengagement.

PHILIP G. MAY.

J UVENAL. GRIGNOLO.

